signal/powerpc: Factor the common exception code into exception_common

It is brittle and wrong to populate si_pkey when there was not a pkey
exception.  The field does not exist for all si_codes and in some
cases another field exists in the same memory location.

So factor out the code that all exceptions handlers must run
into exception_common, leaving the individual exception handlers
to generate the signals themselves.

Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

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